$Periplaneta$ shows

Describe the structure of oothecae in cockroach.

The nymph of a cockroach is known as:

Which of the following statement$(s)$ is/are correct?
$(i)$ Cockroaches are brown or black bodied animals that are included in class $Insecta$ of phylum $Arthropoda$.
$(ii)$ Males bear a pair of short,thread-like anal styles which are absent in females.
$(iii)$ The heart of a cockroach consists of an elongated muscular tube lying along the mid-dorsal line of the thorax and abdomen.
$(iv)$ The nymph grows by moulting about $13$ times to reach the adult form.

The number of abdominal segments in male and female cockroaches is . . . . . . .

In female cockroach,the $7^{th}$ sternum is $:-$